linux-phytec-ti

bcm63xx_enet: drop unneeded NULL phy_clk check

clk_disable and clk_unprepare are NULL-safe, so need to duplicate the
NULL check of the functions.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>